21313401 has 4 divisors (see below), whose sum is σ = 28417872. Its totient is φ = 14208932.

The previous prime is 21313379. The next prime is 21313429. The reversal of 21313401 is 10431312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21313401 - 2¹³ = 21305209 is a prime.

It is a super-2 number, since 2×21313401² = 908522124373602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21313451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3552231 + ... + 3552236.

It is an arithmetic number, because the mean of its divisors is an integer number (7104468).

Almost surely, 2^21313401 is an apocalyptic number.

It is an amenable number.

21313401 is a deficient number, since it is larger than the sum of its proper divisors (7104471).

21313401 is an equidigital number, since it uses as much as digits as its factorization.

21313401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7104470.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21313401 is about 4616.6439108946. The cubic root of 21313401 is about 277.2581058996.

Adding to 21313401 its reverse (10431312), we get a palindrome (31744713).

The spelling of 21313401 in words is "twenty-one million, three hundred thirteen thousand, four hundred one".